Navigator-free multi-shot diffusion MRI via non-local low-rank reconstruction.

ABSTRACT:

Purpose

To develop a non-local low-rank (NLLR) reconstruction method for multi-shot EPI (ms-EPI) in DWI, addressing phase inconsistencies and noise issues while maintaining high spatial resolution in clinically feasible scan times.

Theory and methods

Single-shot EPI (ss-EPI) is widely used for DWI but suffers from geometric distortions and T₂* blurring. ms-EPI improves spatial resolution but introduces shot-to-shot phase variations requiring correction strategies. Traditional navigator-based approaches may increase acquisition time. Recent low-rank regularization reconstruction techniques, such as locally low-rank (LLR) methods, can estimate the phase errors but rely strictly on local neighborhood information along the shot dimension. The proposed NLLR method exte

SUBMITTER: Dong Y 

PROVIDER: S-EPMC12309880 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature